Dear Mr. President: I am writing you as a dutiful, concerned, and stressed-out husband and expectant father from Charleston, West Virginia. My first child is due in just three weeks. I don't know how I am going to safely care for my son after he is born when I can't trust my water supply.

Think about how many times you've used clean water today. Did you wake up and take a sip of water from the glass on your bedside table? Did you take a shower, brush your teeth, use the bathroom and wash your hands? Did you make a cup of coffee?

Social impact is much more challenging to measure than financial results, so we use a combination of metrics to gauge our success in helping social entrepreneurs build sustainable and scalable enterprises.

In the time it takes you to read this post, another eight children in developing countries will have died from water-related illnesses. That, I think we can all agree, is no way to start the school year.

Our UN delegation is worried about the legal implications if access to water is defined as an inalienable right. Let's get the moral principle down on paper that water will not be denied to those who can't afford to pay.

In a fundraising appeal he sent out last week, Senator Bennet criticized the "corporate loopholes" that lead to "catastrophic financial and environmental disasters." Mr. Bennet's stance, however, contained a loophole of its own.

Some experts think the number of people with unsafe drinking water could easily be 2 billion -- maybe even more. The statistics are fuzzy and no on really knows how bad it is. They just know it is bad.